Malicious PDF — malware analysis report

Static analysis result for SHA-256 1220c9bc09b6b2b5…

MALICIOUS

PDF

89.1 KB Created: 2021-05-27 22:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cdd09d698eca4eb418a20c51d2438ca6 SHA-1: 11689e8924e944017b2498f7cdf1a80ae2214bb2 SHA-256: 1220c9bc09b6b2b58a20cdb617e3427a90b904387c2ce67c2ab4547d46ad8e2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is dafemum.ru. While no scripts were explicitly extracted, the PDF structure and the malicious link suggest an attempt to lure the user to a compromised site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=solving+recurrence+relations+using+generating+functions+examples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_602498c3480ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_602ceeda9ade2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6004df5366e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_602ae79b2deb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_6031ebff0533e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd7c05126069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_6066d1dcb35b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_601456a92a2b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_603fe7d2414fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_602d78868aaee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_60627e322a543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12bd316-f44d-4943-af30-2be6b5652bc7/fajogekexiwelotoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b7d5c0-e785-48a3-bd48-c394255fa86a/23574730269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180b437e-b86a-4f3a-b8c9-bf9811fb4f0d/wegala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf68c62a-a4c3-4450-94e1-2b505a646e91/gipokuxagavipipewagudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7eee3b4-bc5a-46b4-aedb-d190600cefeb/how_to_say_primary_care_doctor_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e273ce-b8c7-48e1-9098-d18bc0d6bc0c/16580736144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174a19a2-ee6b-4af5-8cec-4f908ba7b2b3/will_there_ever_be_a_harry_potter_remake.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 5564 bytes
SHA-256: 3dc27b094b25a1a64fddd1072b0c5460bb9492999830695b11262e0c38b291f7
font_01_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 12024 bytes
SHA-256: 9198ababe33770a9db8f363772c3b3e3b93bac25533ad5cc03a4fd11c104135f

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